Nurling-tool.



No. 632,358. Patented Sept. 5, I899. T. H. MILLER. NURLING TOOL.

(Application 111 a Mar. 21, 1898.) (No Model.) 2 Shaets8hoet l.

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Patented Sept. 5, I899.

H0 LT G m L R TN om 5 2 3 6 0 N (Application filed Mar. 21, 189B.)

2 Sheets-Sheet 2.

(No Model.)

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NURLlNG-TOOL.

SPECIFICATION forming part of Letters Patent No. 632,358, datedSeptember 5, 1899.

Avplication filed March 21, 1898. Serial No. 674,639. (No model.)

To all whom it may concern:

Be it known that I, THEODORE H. MILLER, a citizen of the United States,and a resident of the city of New York, borough of Brooklyn, in thecounty of Kings and State of New York, have invented certain new anduseful Improvements in Nurling-Tools, of which the following is aspecification.

This invention relates to improvements in hurling-tools; and it is thepurpose of the invention to provide such a tool that will be moreeffective on smaller work (and especially when the work is very long ascompared with its diameter) than will existing tools. This advantage isattained by arranging the knurls in such a manner on arms which arecapable of being moved toward or from each other that the knurls,assuming there are two, will bear 011 the work at diametrically oppositepoints. The arms are equipped with suitable means, such as nut andscrew, for pressing the knurls on the work.

With this construction and arrangement of parts, no matter how small thework may be, the one knurl resists the pressure of the other, the workcannot spring away from the knurls, and the knurls may be forced withany desired pressure on the work. Suppose, for example, that the work isa small long rod or tube set up and rotated in a lathe in the usualmanner, the nurling-tool being carried on the tool-post of thelathe-carriage. With existing hurling-tools, wherein the knurls, one orall, bear on the same side of the work, as the tool comes to the middlethe work springs so much that the knurls become practically inoperativeand good work cannot be done. With my tool, however, it is indifferentwhether the work be long or short and as good work will be done at themiddle of such a rod or tube as at the ends. My tool will also knurlsmaller work than will any other tool, because the knurls can beapproached until they actually touch each other without losing theireffectiveness.

Referring to the drawings which accompany the specification to aid thedescription, Figure 1 is a side elevation, and Fig. 2 a plan, of thepreferred form of my tool applied to small work. Fig. 3 is a sideelevation, and Fig. 4 a plan, of the same tool applied to large work.Fig. 5 is a modification wherein the lower arm is straight and the upperhas a bellcrank shape. Fig. 6 is a modification wherein the end of thearm 0 is so formed as to constitute a pivot for said arm. Fig. 7 is amodification wherein the arms which carry the knurls have a right-linemotion on the guide of a head which is carried on the stock of the tool.

Referring to Figs. 1 to 4, inclusive, A is the stock, which is adaptedto be fixed in any suitable machine, as in the tool-post of a lathe; B,a bell-crank arm pivoted thereon at b and carrying the knurl G; C, anarm carrying the other knurl F and pivoted at c on the web I) of saidarm B; D, a screw pivoted on said arm B at d and passing through a slotbetween the cheek-pieces of said arm 0, as shown, and E a nut on saidscrew D and provided with a rounded surface e,which is adapted to have asubstantially equal bearing on said arm 0 whatever may be the angle ofsaid screw D in the difierent positions of said arm.

When the work is sufiiciently small to be inserted between the knurls FG, as shown in Fig. 1, the position of said knurls is such that theybear on the work at diametrically opposite points, and therefore thepressure of the knurls on the work may be raised to any desired degreeby the nut E without any liability of springing the Work. This isparticularly advantageous when nurling a long rod or tube of smalldiameter, as has been hereinbefore explained. The work is of courserevolved in any suitable manner, as by being placed in a lathe.

The common knurlwork being of a checkpattern, as indicated on the nut E,the face of the one knurl may be suitable for making the impressions onthe work in the one direction, and the face of the otherknurl suitablefor making the cross-impression, or the entire pattern may be put on thefaces of both knurls, and of course any pattern may be placed on theknurls.

The tool may be adapted to work that is too large to go between theknurls by placing a block g between the arms B O and screwing nut Ehome. The knurls are then applied to the work (indicated by H in Fig. 3)as shown in that figure.

Referring to Fig. 5, the arm B, which is now practically straight andpivoted on the stock A at 5 carries the knurl G, and the arm 0, beingnow of bell-crank shape and pivoted on said arm B at c, carries theknurl F. The arrangement and purpose of the screw D and nut E and theapplication of the tool are the same as described in connection withFigs. 1 to 4:.

Referring to Fig. 6, the bell-crank arm 0 is not now pin-connected withthe arm 13, which is substantially straight, but has a rounded nose 0which rests in a depression in the adjacent edge of arm B, and thusserves as the pivot of said arm 0 The arrangement and operation of thisscrew D, nut E, and knurls F G are the same as hereinbefore described.

Referring to Fig. 7, on the stock A is pivoted at 70 a head K, providedwith a guide-rib Z. The arms L M, respectively carrying the knurls F G,work on said guide-rib and are approached toward or moved from eachother by the screw N, which is positioned and held against longitudinalmovement by the box n, carried on said head K. The arrangement andapplication of the knurls F G are the same as hereinbefore described.

It is now apparent that all the modifications of my tool are equallycharacterized by' aplnrality of knurls so positioned that the knurls canbe brought to hear at diametrically opposite points of Work that issmall enough to go between the knurls, the knurls being carried on armsthat are movable toward and from each other and provided with means forproducing any desirable pressure of the knurls on the work, and thiscombination is generally my invention, however the form and arrangementof the specific parts may be modified.

Now, having described my improvements, I claim as my invention- 1. Ahurling-tool adapted to be used on a lathe or other suitable machine andcharacterized by a stock which is adapted to be fixed on the carriage ofthe lathe, and a plurality of knurls adj ustably positioned on the saidstock and adapted to bear on substantially diametrically opposite pointsof the work, substantially as and for the purpose described.

2.'A nurling-tool adapted to be fixed in the tool-post of a lathe orother suitable machine and consisting of a stock for insertion in saidtool-post, a plurality of knurls adapted to bear on substantiallyopposite sides of the work, a self-adjusting connection between saidknurls and said stock,and means for moving said knurls toward orseparating them from each other, substantially as described.

3. The combination in a nurling-tool of a stock A adapted to be securedin a suitable machine, arms B G carried movably on said stock, knurlscarried by said arms B C, and a screw D and nutE for varying thedistance between said knurls, substantially as described.

Signed at New York city, in the county of New York and State of NewYork, this 16th day of March, A. D. 1898.

THEODORE II. MILLER.

Witnesses:

H. L. Asonomr, B. R. KENwoR'rI-IY.

